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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcb3c81c18246d1266dc0e67968db0ae007287991b4b35de10e8874fe9bd442' 
  AND token = '6VPp9qIh1ixTDu1v5Kw37PWdVAita5ObK1JOxGYkbKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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