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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379852e05939dfd251c2efff6095fcfe6fe38963132314788c587684354f6b8a' 
  AND token = 'AkQnLM1XwBZ0wmcSL364nDj3pbhwW0jahn343jwqSl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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