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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e922514be1cd579720850aabcf880813980412c4ba60af86af66721d729499b2' 
  AND token = 'Vqv1uYSxez4+O3EF0PXEmwCZu4ZYsF6c/kSxFp7QM0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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