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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090642c685bfcdd67034be52f388410b1ca6f1c1746da762e67e74898bb3534a' 
  AND token = 'dYc04x2mGQ2dsyveg/1oQPc7jOHL3aMyLz/nubDUNGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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