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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77bcdcfc8af3be99cef4dff9097ba7b9c6400339598f9e71bb83ae64e43335a' 
  AND token = 'q7rqUDGDTv0z5AfD3vxWre3aTxLHpGQkmjPPhsk/U2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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