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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ff2dc28c74c55d32b1c64710e1628d3d9a4b4b0cb8ff46b519606ae0b8afe6' 
  AND token = 'SNrq8oQKC9P0A9fuaWMxca0ZFt44v1CBcIPFxrAXv3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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