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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bfd0cc60b46850a049e42a9e2fca5ca1a0742e2f5d129a2285cdbdc2d50f13' 
  AND token = 'Cr006kYrTjZYvW4n1oaalT4lJ+o+F/CaqRwYDR5pBYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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