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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf907fbb2d0ab43fae89a61b5cb810f0b42185b1ff6526d754bf32b937322cc' 
  AND token = '6ttn8qokTbjnQxyr3VotIVC12E0L68u49goMknVMmsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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