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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a90b0f638838912c08ed829319fcf03f32cef0ec39d9e7ead26f75349ee45a' 
  AND token = 'q0JaKWUbvu+6ZVKR/ew5hV45eF0ymScTp0JZrQ059Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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