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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fdaa89200f74b2b94ccbfe10a1084cadcdd54f0be278b868dccb947a2e03e0' 
  AND token = 'V5Z90EB/PIYQlt+cxif2jqlRQuH+ECTT76mtT3EvRDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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