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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af831b4bb5333a52125daf5d20ac6a55c9bb2e94a7d87593f77bb64709fdacbd' 
  AND token = 'zWJJac+IIzJO6P9TuAH3SWnsjmUadx3BCBogQI9ew1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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