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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56369023af1d232ceda594173d547de121aee1ddc447ae4b4dec5dc78fce92b2' 
  AND token = 'C3gD02aNvup17dwaBQ9eYh0aadGbWpmQFQpTADDJ+g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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