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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2466c3807f510be314aff1ce803b84a950e1381927675b4b2a0b8592159a85b5' 
  AND token = 'FYsNIFY88+KM8KKcOz3Cg82iNVNUL8dz6Tvx8f0l1is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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