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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0011844e70a0853e13270ce6c5ebddb34d54ab28d2ff7a150ef28b8a4839a6' 
  AND token = 'HwcsMrl3g0BKBRWmvLlsc5m2/N9wYd1Wa7qina5db1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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