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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b86687b21432637e0c1a537308be3347838b7877ef8ca3f5309bf1e80670788' 
  AND token = 'vYzERdDQs3BsfUN2O7zA3ILoS3DsN5QrpznpEX3v+PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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