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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab15090d304ca76f19681134de59fc3b89f5a79b436ec4435413073b754a9d2' 
  AND token = 'kAidrwYgtrgaDEzt5vUqc6hT07o3jyQEVVi2Z61WQeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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