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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5eb78d4cae4f7f9ab9f70e0795ce7d5fe7c8fcafb41a83091e5be7a8b71983' 
  AND token = 'MuhN+d3cB94Ax4KJ5C7ADehwhTelTTdrG2bLSBfKJYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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