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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16be0e7b9e7870b8424dd5e145ed553e5b45eeb4d31ee4d79f3bcc6f561b2533' 
  AND token = 'PWWI3kJ7L56TNSb0D0NOdBO3C99E9XdFX0U1H74SD90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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