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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04e43cb174f3598171a7cb285e7355dbb3260737e16cecdb3fb1b5b1cfb05bb' 
  AND token = 'hdhTkG2ya0SNqmX0OBmW+41hpyA2/jeqrbBApy44htM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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