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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe43cdfaa8dab3eb3eb0722e14c7c2dad4007d2c9709308ea6c50c724b9777ef' 
  AND token = 'bps6lb+3jeQJinL+2miTOeJOjNaRtDyY0qeRD9ccNLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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