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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66680b165dba315b64a59efafd5714e8ffac635bf7d6557d3788dcecb15fe4c0' 
  AND token = 'PWpPORXbhtr1ifvVD+WgM5C4r01ngld/mM4uWjiJDGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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