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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef7e85eccbdbd3d56c204765f86eb74831ab5e12beda4125b4c3d5245e77899' 
  AND token = 'EpTURWag26ZK86V4XKFIeZ04nSzV8wDkHTCEa3JIk1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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