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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7a71260e943d67a0b6a8a0d85bc07d62110657401537a07cdff5d142edebfd' 
  AND token = '1KeKSBTmd/jID+L1GAcMnF+6bKYIJbNzryauHcuF2aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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