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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56cf5805c9912191237a10a72e1083b8acfd5533f8c8a5293d636c4775b7862e' 
  AND token = '27RNkN2s2uCv9NzQubijuwj/1YG+nxcAT9A5gQOohqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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