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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86defe14b2a57931c57ee234cef1a4e50ac861ce697294c991e9c21b3554c099' 
  AND token = 'or6nBvPqYV83g+FsX9LGObU1SEDLA+goRWn2XTpFa50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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