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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58cc49f5f7fa05fb68ab14dab58659feb6c19f9840d6d13c6ff18e177239895' 
  AND token = 'w/nQ2w4DwjRi+1Fh9bAhb4xgbamEsK96syBCQ9Aa9vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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