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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5645679a53fd1143d292a78f4414f59111341f261e0b798f8e8bedff767be3cc' 
  AND token = 'OoCb+XSCAy05qB82zEBaV9P88rSsCV1Ad825rqckNV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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