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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65b0e6a2335ceec40e0d47edb82d00d5aba7bcfb6ec74f2b9d44d18e940087f' 
  AND token = 'm17WqemQF/PwoztXPSrtcQtsGSOgTkE4CDGP4O764F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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