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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413b125a467303e3cb0063da18ebe7641cf66ec4d3e8257ccf2a2983c35c8460' 
  AND token = 'fNxRkg5PVln1j1ywg3SJTJRmJfM3zzoMSGlqUrZCM1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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