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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2a1a642273bce3f98cf84cc5d5b64db14ca59c48f454077e09f47fa9cbe79e' 
  AND token = 'LZxjoJkPO4w2c72+kWCZlYdp/y1rd+Z28XzDs18HDQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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