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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5e5311f8aeb751008ce983ba59e28fbcb7bb06e1df597324f25e9f1e452a5a' 
  AND token = 'C7bgUzciPc07pUv7eUyrPdX2/lLZz3eeeVhOM/fmnpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}