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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d9bc6120887ccd7ec2b7b22cec24ef3e1091b20c05601aa4020dc606d3b68c' 
  AND token = 'xvw2FLErNZ1olfUA8Eo8HCvknXE9QajuYcaIDRMLa04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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