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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e175a24539ba27818b285a2a6b67b72f49a1c8c25018e3a7550f68357643daf2' 
  AND token = 'nZMGCK9Y3C8f0ZLeesMfaf1skfIvmRB3cvwpe6ItSFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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