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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02037d920e8a41b9ace2e1773b6fa2a19405f3091db9ec9d3fb0effdcea3dc1e' 
  AND token = 'jXT/5UIS/wSeXpnd2d2y5221N0h9ZRD36O0sDhS5ISE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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