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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfde59fecc475b2d2097d18ff216ba06b59b029c4c724b1c1e6bae3cef1a3c89' 
  AND token = '3bsgaxgh8P+i6yxkEWtBV0osez0NI/Zp+eHufbH8WtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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