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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f05fdd1d75d44b53441a56679b62d6aac04d4d5ad68b4d8e61a7bde4e4552a' 
  AND token = 'fqqDolsrycz1iSslE2+DeW7Y6rUMs4F/SvSM8+oaRk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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