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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10aac365cca13270a86251a65f46d61cb0cad345c4b31dcca057e096ebbe5db6' 
  AND token = 'IFOwmQkWhOfsy0BRu4tK6U2dfgl+HXmNWIV9JDEnsEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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