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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec23eaaf0e3338dd196fd2f5c230a71d6018cfd4b82f0c7cf6f8a5e6d435a56' 
  AND token = 'POT7Q1JGQ5Xz8fumu/AR2O2RLRETyHMyfodT5Din8Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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