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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c7f5bf1a384ebfd00106b63798d9762a57673290dccf3e250be0160306ba9a' 
  AND token = 'iLLFO+aNqmWa+HHe29JHRm2RffXojdduGA5PVEt2ENY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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